ISA828
Focusrite
ISA828
Focusrite ISA 828 8-Channel Microphone Preamp
This is the first audio A-D converter to use Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips. With cutting-edge conversion technology seated within Focusrite custom analogue circuitry, the card delivers unparalleled performance, with a dynamic range of 122dB and jitter less than 250 picoseconds.
The card can be retrofitted at any time and integrates seamlessly with ProTools HD as well as other popular hard disk recorders and mixing desks with a convenient 25-pin D-type connector.
Digital formats include an eight-channel single/dual wire AES/EBU and SPDIF output, as well as an eight-channel ADAT lightpipe (SMUX/SMUX2) output. Wordclock i/o is provided via dedicated BNC connectors.
The card can be retrofitted at any time and integrates seamlessly with ProTools HD as well as other popular hard disk recorders and mixing desks with a convenient 25-pin D-type connector.
Digital formats include an eight-channel single/dual wire AES/EBU and SPDIF output, as well as an eight-channel ADAT lightpipe (SMUX/SMUX2) output. Wordclock i/o is provided via dedicated BNC connectors.
Product Weight: 19.5 lbs
Dimensions: 19"W x 3.5"H x 12"D (13.8" depth with heat sink)
Technical Tools
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Manufacturer Specs
Mic Input Response
• Gain range = 0dB to 60dB in 10dB steps
• Input Impedance, variable as follows:
• EIN (equivalent input noise) = -126dB measured at 60dB of gain with 150 Ohm terminating impedance and
22Hz/22kHz bandpass filter
• Noise at main output with gain at unity (0dB) = -97dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (9dBu) = 106dB
• THD at medium gain (30dB) = 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency response at minimum gain (0dB) = -0.5dB down at 10Hz and –3dB down at 110kHz
• Frequency response at maximum gain (60dB) = –3dB down at 16Hz and –3dB down 85kHz
• CMRR=91.8dB (Channel 1, 1kHz, maxiumum gain)
• Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA
Line Input Response
• Gain range = -20dB to +10dB in 10dB steps
• Input Impedance = 10kΩ from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB) = -96dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (24dBu)=120dB
• Signal to noise ratio relative to 0dBFS (+22dBu) = 118dB
• THD at unity gain (0dB) = 0.001% measured with a 0dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at unity gain (0dB) = 0.3dB down at 10Hz and –3dB down at 122kHz
Instrument Input Response
• Gain range = 10dB to 40dB continuously variable
• Input Impedance:
High >1MΩ
Low > 300kΩ
• Noise at minimum gain (+10dB) = -90dBu measured with a 22Hz/22kHz bandpass filter
• Noise at maximum gain (+40dB) = -62dBu measured with a 22Hz/22kHz bandpass filter
• THD at minimum gain (+10dB) = 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at 10dB gain with -10dB input = 10Hz-200kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input = -2.5dB down at 10Hz and 0dB at 200kHz
High Pass Filter
• Roll off = 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point
Input Meter
• Calibrated in the detent position for 0dBFS = +22dBu and indicates the level after the High Pass Filter and before the Insert Send output. LED levels are as follows:
0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
• Calibration is adjustable to allow 0dBFS to equal +10dBu to +26dBu
• Gain range = 0dB to 60dB in 10dB steps
• Input Impedance, variable as follows:
| Switched Impedance setting | Equivalent Input Impedance at 1kHz |
| Low | 600 Ω |
| ISA 110 | 1400 Ω |
| Med (Medium) | 2400 Ω |
| High | 6800 Ω |
• EIN (equivalent input noise) = -126dB measured at 60dB of gain with 150 Ohm terminating impedance and
22Hz/22kHz bandpass filter
• Noise at main output with gain at unity (0dB) = -97dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (9dBu) = 106dB
• THD at medium gain (30dB) = 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency response at minimum gain (0dB) = -0.5dB down at 10Hz and –3dB down at 110kHz
• Frequency response at maximum gain (60dB) = –3dB down at 16Hz and –3dB down 85kHz
• CMRR=91.8dB (Channel 1, 1kHz, maxiumum gain)
• Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA
Line Input Response
• Gain range = -20dB to +10dB in 10dB steps
• Input Impedance = 10kΩ from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB) = -96dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (24dBu)=120dB
• Signal to noise ratio relative to 0dBFS (+22dBu) = 118dB
• THD at unity gain (0dB) = 0.001% measured with a 0dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at unity gain (0dB) = 0.3dB down at 10Hz and –3dB down at 122kHz
Instrument Input Response
• Gain range = 10dB to 40dB continuously variable
• Input Impedance:
High >1MΩ
Low > 300kΩ
• Noise at minimum gain (+10dB) = -90dBu measured with a 22Hz/22kHz bandpass filter
• Noise at maximum gain (+40dB) = -62dBu measured with a 22Hz/22kHz bandpass filter
• THD at minimum gain (+10dB) = 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at 10dB gain with -10dB input = 10Hz-200kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input = -2.5dB down at 10Hz and 0dB at 200kHz
High Pass Filter
• Roll off = 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point
Input Meter
• Calibrated in the detent position for 0dBFS = +22dBu and indicates the level after the High Pass Filter and before the Insert Send output. LED levels are as follows:
0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
• Calibration is adjustable to allow 0dBFS to equal +10dBu to +26dBu